Gravitation — Physics STD 11 Science — Question

How is a heat engine different from a refrigerant?

As the speed of a particle increases, its rest mass:

1. Increases.
2. Decreases.
3. Remains the same.
4. Changes.

An observer on the seashore sees waves reaching the shore, what type of waves does the observer see? Why?

What is the ratio of the SI to the CGS units of momentum?

Give the magnitude and direction of the net force acting on.
A car moving with a constant velocity of 30km/h on a rough road.

If no external torque act on a body, will its angular velocity remain conserved?

How does density of a solid change as it is heated?

There are equal number of molecules of hydrogen and oxygen in a box. If a tiny hole is made in the box, which gas will leak out rapidly and why?

A monkey climbs up a slippery pole for 3 seconds and subsequently slips for 3 seconds. Its velocity at time t is given by v(t) = 2t(3 - t); 0 < t < 3 and v(t) = -(t - 3)(6 - t) for 3 < t < 6s in m/s. It repeats this cycle till it reaches the height of 20m.
At what time is its acceleration maximum in magnitude?

How are the atoms and molecules arranged in a crystalline solid?